[openstreetmap-website] Retain editor/location URL parameters throughout user signup (#400)

[Alex Barth]

> If I share it with a user who isn't logged in, the parameters in the URL are retained throughout the login process, but then we lose them once the user goes through e-mail confirmation. 

I can confirm this on 

http://welcome.apis.dev.openstreetmap.org/

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/400#issuecomment-21892921
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